JP7126170B2 - plug-in coupling - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plug-in coupling joint, and more particularly to a joint structure suitable as a fire fighting joint.

Various types of firefighting joints have been used as joints for firefighting, such as joints for firefighting hoses for connecting firefighting hoses, or joints for firefighting equipment for connecting devices such as spears. there is Of these, the plug-in coupling joint, as shown in FIG. 8, has an insertion tool 10 and a receiving tool 20 which are detachable from each other. When the fitting 10 is inserted into the receptacle of the receptacle 20, the locking stepped portion 11b at the proximal end of the tip cylindrical portion 11 of the insert 10 is biased by the leaf spring 25 in the direction of protruding inward. By engaging with the pawl 24 and retaining the locking stepped portion 11b, they are connected to each other (see, for example, Patent Document 1 below). In this connected state, by pushing the push ring 14 movably mounted on the outer periphery of the insert 10 toward the receiver 20, the tip of the push ring 14 contacts the curved driven surface 24a of the locking pawl 24. In order to abut against the plate spring 25 and retract the locking claw 24 to the outer peripheral side of the receiving tool 20, the engagement between the locking claw 24 and the locking stepped portion 11b is released so that the insert 10 and the receiving tool 10 are disengaged from each other. The coupling state of the tool 20 is released.

By the way, the push ring 14 has a flange portion 14a that spreads toward the outer periphery, and a cylindrical portion 14b that extends from the flange portion 14a toward the receiving member 20 side. The collar portion 14a is a portion for hooking a finger when an operator pushes the push ring 14 toward the receiving tool 20, and the distal end of the cylindrical portion 14b is positioned so that the locking claw 24 is positioned on the outer peripheral side as described above. It is a part for pushing into and retracting. However, when the plug-in coupling joint as described above is used at a connection point between fire hoses, etc., when the plug-in coupling joint comes into contact with the ground, floor, stairs, etc. during firefighting activities, the flange may When 14a receives an external force in the axial direction, there is a problem that the push ring 14 may malfunction and the insert 10 and the receiver 20 of the plug-in coupling joint may come off.

Therefore, conventionally, as shown in Patent Documents 2 and 3 below, a C-shaped member (disengagement prevention tool 20, lock member 20) is mounted between the push ring 14 (flange 14a) and the receiving tool 20. Alternatively, as shown in Patent Documents 4 and 5, the protective member (band) 27 of the receiving tool 20 may be partially arranged between the collar portion 14a of the push ring 14 and the tightening ring 23. This prevents the push ring 14 from moving toward the receiver 20 side.

JP 2003-185079 A JP-A-2000-329280 Japanese Patent Application Laid-Open No. 2004-011860 JP 2017-213065 A JP 2018-031464 A

However, in the method of attaching and detaching a member that hinders the operation of the push ring 14 as in Patent Documents 2 and 3, the member is attached or detached when coupling and releasing the insertion tool and the receiving tool of the plug-in coupling joint. In addition, in an emergency, the member may be forgotten to be attached, or the member may be lost. On the other hand, as in Patent Documents 4 and 5, in the method of using the protective member 27 having a shape that hinders the movement of the push ring 14, the operation for releasing the coupled state is complicated, and the durability of the protective member 27 is reduced. In addition, there are problems such as an increase in manufacturing cost due to the manufacturing of a special-shaped protective member.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to solve the above-mentioned problems, and to provide a new structure for a plug-in coupling joint, particularly a insert, which can prevent the release of the coupled state due to malfunction even if an external force is applied to the push ring. It is to provide structure.

In order to solve the above-mentioned problems, a plug for a plug-in coupling joint of the first invention is connected by a locking claw of the receiving member in a state of being inserted into the receiving member, and the engaging claw is held by a push ring. An insertion tool for an insertion type coupling joint that is retracted to release a coupled state, the distal cylindrical portion having a locking stepped portion engageable with the locking pawl on the base end side in the axial direction, the locking stepped portion and a push ring axially slidably mounted on the base end outer circumference, wherein the push ring is attached to the base end The inner surface portion facing the proximal-side outer peripheral portion of the push ring when arranged in the proximal-side non-operating area on the side outer peripheral portion is located at a first axial position on the proximal-side outer peripheral portion. a first inner surface region configured to be able to abut against and having a first inner and outer dimensional difference (ΔR ₁ ) between the base end side outer peripheral portion at the first position and the first position; is configured to be able to come into contact with the proximal side outer peripheral portion at a second position in a different axial direction, and the first inner-outer dimensional difference (ΔR ₁ ) and a second inner surface region having a second inner-outer dimensional difference (ΔR ₂ ) greater than 1).

According to the present invention, the inner surface portion of the push ring arranged on the outer surface of the insertion tool is configured to be able to abut on the proximal side outer peripheral portion, and the inner and outer dimensional difference between the proximal side outer peripheral portion is mutual. By providing a first inner surface region having a first position and a second inner surface region having a second position, the second inner surface region between the proximal side outer peripheral portion of the second inner surface region and the second inner surface region Compared to the case where the inner-outer dimensional difference (ΔR ₂ ) is equal to the first inner-outer dimensional difference (ΔR ₁ ) between the first inner surface region and the proximal-side outer circumference, The push ring can be configured to be tiltable over a greater range of angles at . As a result, when an external force is applied to the push ring, the inclination angle of the push ring becomes larger on the outer peripheral portion on the base end side, so that the external force does not act as a driving force toward the tip side of the push ring in the axial direction. , is converted into a moment of force on the proximal circumference of the insert. As a result, the push ring is less likely to malfunction due to an external force, thereby preventing unintended release of the connected state of the plug-in connection joint.

In the present invention, it is preferable that the first inner surface region is arranged on the proximal end side in the axial direction of the inner surface portion, and the second inner surface region is arranged on the distal end side in the axial direction of the inner surface portion. . According to this, the second inner-outer dimensional difference in the second inner surface region arranged on the distal end side in the axial direction is greater than the first inner-outer dimensional difference in the first inner surface region arranged on the proximal end side in the axial direction. is large, it is possible to move the distal end side of the push ring to a greater extent in the radial direction than the proximal end side of the push ring. By increasing the range of motion in the radial direction of the tip side of the push ring while suppressing the deterioration of operability, the inclination angle of the push ring can be further increased, so the external force applied to the push ring is converted into a moment. It is possible to more reliably prevent the push ring from advancing toward the receiver.

In the present invention, the second inner dimension (Ri ₂ ) of the portion corresponding to the second inner-outer dimension difference (ΔR ₁ ) in the second inner surface region is the first inner-outer dimension in the first inner surface region. It is preferably larger than the first inner dimension (Ri ₁ ) of the portion corresponding to the difference (ΔR ₂ ). According to this, by providing the first inner surface region having a small first inner dimension (Ri ₁ ), it is possible to reduce the backlash of the push ring on the outer peripheral portion on the base end side, and at the same time, the large second inner dimension (Ri 1 ) is provided. Since the interference with the outer surface can be further reduced by Ri ₂ ), the tiltable angle range can be efficiently increased by the shape of the inner surface of the push ring. Further, in order to increase the maximum inclination angle α, which will be described later, by providing a second inner surface region with a large second inner dimension, the axial range (e.g., length ( L ₁ )) can be lowered. Further, in this case, the outer dimension of the base end side outer peripheral portion is changed in order to configure the magnitude relationship between the first inner and outer dimension difference (ΔR ₁ ) and the second inner and outer dimension difference (ΔR ₂ ). no longer needed. For this reason, the base-side outer peripheral portion has a constant outer dimension in the axial direction at least within a range in which the push ring can move in the axial direction between an operating region in contact with the locking pawl and the non-operating region. It is even more desirable to be prepared. According to this, by configuring the outer dimension of the base end side outer peripheral portion to be constant in the axial direction within the movable range of the push ring, the push ring can be operated on a flat outer surface. Operability can be further improved.

In the present invention, the first inner surface area is an area having the first inner dimension (Ri ₁ ) constant in the axial direction, and the second inner surface area has the second inner dimension constant in the axial direction. It is preferably a region comprising (Ri ₂ ). Since the first inner surface region has the constant first inner dimension (Ri ₁ ) in the axial direction, it is possible to enhance the stability of the sliding motion during the releasing operation of the push ring. Here, it is preferable that the first inner surface region and the second inner surface region are arranged adjacent to each other in the axial direction. In these cases, furthermore, the second inner dimension (Ri ₂ ) and the axial length (L ₂ ) of the second inner surface region are equal to the first inner dimension (Ri 2 ) of the first inner surface region. Ri ₁ ) and the axial length (L ₁ ) is preferably set to a value that does not limit the maximum tilt angle (α). For example, when the second inner surface portion has a range that reaches the tip side edge portion in the axial direction of the push ring, the tip inner edge that can contact the base end side outer peripheral portion of the first inner surface region. (That is, the inner edge at the boundary position between the second inner surface region) (P ₂ ) and the tip inner edge (P 3 ) formed at the tip side edge of the second inner surface region (P ₃ ) are the axes. It is desirable that the limit tilt angle (β) with respect to the axis of the tilt line connecting the directions is equal to or greater than the maximum tilt angle (α).

In the present invention, said first inner surface area is an area with said first inner dimension (Ri ₁ ) which is axially constant and said second inner surface area is axially separated from said first inner surface area. Preferably, the second inner dimension (Ri ₂ ) gradually increases according to the region. Since the first inner surface region has the constant first inner dimension (Ri ₁ ) in the axial direction, it is possible to enhance the stability of the sliding motion during the releasing operation of the push ring. Here, it is preferable that the first inner surface region and the second inner surface region are arranged adjacent to each other in the axial direction. In these cases, furthermore, the second inner dimension (Ri ₂ ) and the axial length (L ₂ ) of the second inner surface region are equal to the first inner dimension (Ri 2 ) of the first inner surface region. Ri ₁ ) and the axial length (L ₁ ) is preferably set to a value that does not limit the maximum tilt angle (α). For example, when the second inner surface portion has a range that reaches the tip side edge portion in the axial direction of the push ring, the tip inner edge that can contact the base end side outer peripheral portion of the first inner surface region. (that is, the inner edge at the boundary position between the second inner surface region, the tip inner edge P ₂ of the first inner surface region) and the tip inner edge formed at the tip side edge of the second inner surface region It is preferable that the limit tilt angle (β) with respect to the axis of the tilt line connecting (P ₃ ) and (P 3 ) in the axial direction is equal to or greater than the maximum tilt angle (α). The second inner dimension (Ri ₂ ) should be larger than the first inner dimension (Ri ₁ ). (step) may or may not be present.

In each of the above inventions, the first axial length (L ₁ ) of the first inner surface region is preferably smaller than the second axial length (L ₂ ) of the second inner surface region. . In particular, it is desirable that the first length (L ₁ ) is less than half the length (L ₂ ). According to this, the length (L ₁ ) of the first inner surface region having a small first inner-outer dimensional difference (ΔR ₁ ) with the proximal side outer peripheral portion is set between the proximal side outer peripheral portion Since the length (L ₂ ) of the second inner surface region having the large second inner-outer dimension difference (ΔR ₂ ) can be made smaller, the tiltable angle range of the push ring can be set even larger.

In each of the above inventions, the push ring includes a flange-shaped flange (15a) projecting toward the outer peripheral side at the base end side or intermediate portion in the axial direction, and extending from the flange portion (15a) toward the distal end side in the axial direction. It is preferable to have a cylinder part (15b). According to this, by providing the flange on the base end side or the intermediate portion, the push ring can be easily pushed into the distal end side by the flange portion, so that the operability is improved, and the push ring can be pushed from the flange portion to the distal end side. By providing the extending cylindrical portion, the locking pawl can be reliably retracted.

Next, a plug-in coupling joint of the present invention includes any one of the above-described inserts, a receptacle adapted to receive the tip tube portion, and being biased in a projecting direction inside the receptacle. A coupled state is formed by engaging with the locking stepped portion, and in the coupled state, the push ring inserted into the operating area on the distal end side on the proximal side outer peripheral portion retracts and the coupled state is released. and a receptacle having a locking pawl configured as a plug-in coupling joint.

In this case, the distal end portion of the push ring in the non-operating area is configured to be able to abut against the tip inner edge portion of the receptacle of the receptacle due to the inclined attitude of the push ring with respect to the base end side outer peripheral portion. is preferred. According to this, the tip of the push ring comes into contact with the inner edge of the tip of the receptacle in front of the locking pawl, thereby restricting further tilting of the push ring. This abutment on the inner side of the socket more reliably avoids the action of the push ring on the locking pawl, and also fixes the tilted posture of the push ring that receives external force, thereby further ensuring that the push ring does not malfunction. can be prevented. Here, the distal inner edge portion has a first inner edge portion disposed on the distal side of the receptacle and a second inner edge portion disposed on the proximal side of the first inner edge portion. The inner dimension of the second inner edge portion is smaller than the inner dimension of the first inner edge portion, and the distal end portion of the push ring is configured to be able to contact the first inner edge portion due to the inclined posture. is desirable. When the push ring assumes an inclined posture, even if the tip does not contact the first inner edge, the tip of the push ring is located outside the inner dimension of the second inner edge. If it is constructed so as to approach the first inner edge, the second inner edge having a smaller inner dimension stands on the tip side in the axial direction of the tip of the push ring. Further sliding of the push ring can be suppressed by moving to the side and contacting the tip portion with the second inner edge portion.

In each of the above inventions, it is preferable that a surface on the base end side of the collar portion of the push ring is provided with an inclined surface facing diagonally outward in the radial direction. In this case, it is desirable that the base-end-side surface is provided with a finger hook portion formed in a concave shape with respect to the inclined surface. In this case, the finger hooks are preferably provided at equal intervals around the axis, and more preferably provided at four locations at equal intervals.

According to this invention, since it is possible to increase the tiltable angle range of the push ring in the non-operating area, it is possible to make it difficult for the push ring to move to the operating area even if an external force is applied. In the coupled state of the coupling joint, malfunction of the push ring due to external force can be suppressed.

1 is a vertical cross-sectional view showing a state in which an insertion tool and a receiving tool are coupled in the first embodiment of the plug-in coupling joint according to the present invention; FIG. FIG. 4 is an enlarged partial cross-sectional view showing an enlarged part of a connecting portion centering on a push ring of the insert and the receiving portion in the same first embodiment. FIG. 4 is a cross-sectional view showing a state when an external force F is applied to the push ring in the first embodiment; FIG. 2 is an enlarged partial cross-sectional view showing an enlarged part of a connecting portion centering on a push ring between an insert and a receiving portion when an external force F is applied to the push ring in the same first embodiment. FIG. 10 is an enlarged partial cross-sectional view showing another part of the connecting portion around the push ring of the insertion tool and the receiving part when an external force F is applied to the push ring in the first embodiment. FIG. 5 is an explanatory diagram for explaining the relationship between the shape of the push ring in the standard posture and the tilted posture in the first embodiment; FIG. 10 is an explanatory diagram for explaining the relationship between the shape and the action in the tilted posture of the push ring with reference to the base end side outer peripheral portion in the first embodiment; FIG. 10 is a vertical cross-sectional view showing the configuration of a conventional plug-in coupling joint for firefighting. FIG. 5 is an axial front view of a push ring used in a second embodiment of a plug-in coupling joint according to the present invention; It is the side view (a) and longitudinal cross-sectional view (b) of the push ring of the same 2nd Embodiment. It is a longitudinal cross-sectional view which shows the state by which the insertion tool and the receiving tool were couple|bonded in the same 2nd Embodiment. It is an enlarged fragmentary cross-sectional view showing an enlarged part of a connection portion centering on the push ring of the insertion tool and the receiving part in the second embodiment.

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. First, a plug-in coupling joint 1 of a first embodiment according to the present invention will be described with reference to FIGS. 1 and 2. FIG. Here, FIG. 1 is a vertical cross-section showing a state in which the insert 10 of the fire joint 1 is inserted into the socket 20a of the receiver 20, and the locking claw 24 is completely locked to the locking stepped portion 11 and connected. It is a diagram. 2 is an enlarged cross-sectional view showing the push ring 15 and its surroundings in the connected state of the plug-in coupling joint 1. As shown in FIG.

This plug-in coupling joint 1 comprises an insert 10 and a receptacle 20 . The insert 10 has a tip tube portion 11 with a spigot 10a. The distal cylindrical portion 11 is configured in a cylindrical shape (cylindrical in the illustrated example) having a predetermined outer dimension (outer diameter in the illustrated example, the same applies hereinafter), and extends from the distal outer edge 11p in the axial direction to the base end outer edge 11q. It has a planar (cylindrical in the illustrated example) outer peripheral surface 11a. In addition, an engaging stepped portion 11b facing toward the axially proximal end side (right side in the drawing) is provided at the axially proximal end of the distal end cylindrical portion 11, and this engaging stepped portion 11b allows the subsequent axial direction proximal end to move. The outer dimension of the insert main body at the side outer peripheral portion (hereinafter referred to as the base end side outer peripheral portion) 12 is smaller than the outer dimension of the tip tube portion 11 . The axial length of the tip tube portion 11 and the outer dimensions of the tip tube portion 11 and the base end side outer peripheral portion 12 are defined by JIS B9911-1968 (Dimensions of plug-in fittings for fire hoses, hereinafter the same). ), respectively.

The insert 10 has basically the same structure as the conventional one, but is equipped with a push ring 15 having a different structure instead of the push ring 14 described above. However, the push ring 15 is the same as the conventional one in that it has a flange-shaped collar portion 15a provided on the base end side and a cylindrical tubular portion 15b provided on the distal end side. A different construction of the push ring 15 will be described later. The push ring 15 is arranged on the base end side outer peripheral portion 12 so as to be slidable in the axial direction. Further, the retaining ring 13 defines a regulating position on the base end side of the push ring 15 in the axial direction. In the illustrated state, the push ring 15 is arranged in a non-operating region in which it does not abut against the locking pawl 24 and does not operate. The non-operating region of the push ring 15 is set on the proximal side in the axial direction on the outer surface 12a of the proximal side outer peripheral portion 12. As shown in FIG.

On the other hand, the receptacle 20 has a receptacle 20a, a receptacle main body 22, a tightening ring 23, an engaging pawl 24, a plate spring 25, a pawl seat 26, a protective member 27, and a packing 28, which are similar to those of the conventional structure. A plurality of (three in the illustrated example) locking claws 24 are biased by leaf springs 25 in a direction protruding toward the inner peripheral side of the socket 20 on the far side (base end side in the axial direction, left side in the figure) of the socket 20a. It is Further on the base end side of the locking claw 24 in the axial direction, an inner peripheral portion of a socket 20a is formed so that the tip of the cylindrical portion 15b of the push ring 15 can pass toward the driven surface 24a of the locking claw 24. ing. Here, in the receiver 20, the tip inner edge portion 21 of the socket 20a on the axial direction tip side (right side in the figure) of the locking pawl 24 is, as shown in FIG. The inner edge 26 a of the seat 26 . In the illustrated example, the inner dimension (inner diameter in the illustrated example) of the inner edge 26a on the proximal side in the axial direction (inner side in the drawing, ie, the left side in the drawing) is larger than the inner edge 23a on the distal side in the axial direction (outer side, ie, the right side in the drawing). is getting smaller.

In the conventional example shown in FIG. 8, the inner surface of the push ring 14 is flat in the axial direction, and the outer peripheral portion on the proximal side is also flat in the axial direction. The inner and outer dimension difference of the inner dimension (inner diameter) of the ring 14 is also constant in the axial direction. At this time, the angle range in which the push ring 14 can be tilted is determined by the relationship between the inner and outer dimension difference and the length of the push ring 14 in the axial direction. The tiltable angle range at this time is usually very narrow. In order to widen the range, the difference in inside and outside dimensions should be increased or the length should be shortened. However, if this is done, the backlash as a whole is greatly increased, so that the operability of the push ring 14 at the time of releasing the coupled state is significantly deteriorated.

On the other hand, in the push ring 15 of the present embodiment, the inner surface portion 15i on the inner peripheral side of the collar portion 15a and the cylindrical portion 15b has an inner dimension (distance from the axis 10x (inner radius) or inner diameter) varies with axial position. This is achieved by changing the difference in the inner and outer dimensions (the difference between the outer diameter and the inner diameter or the difference between the outer diameter and the inner diameter) between the outer surface 12a and the inner surface portion 15i of the base end side outer peripheral portion 12 in the axial direction. This is to increase the tiltable angle range of the push ring 15 in the non-operating area on the end side outer peripheral portion 12 . Although different from the illustrated example, by changing the outer dimension of the outer surface 12a of the base end side outer peripheral portion 12 in the non-operating region of the push ring 15 in the axial direction, the range of tilting posture of the push ring 15 can be increased. may

Specifically, in this embodiment, in the inner surface portion 15i of the push ring 15, the inner dimension (inner diameter) of the _first inner surface region 15i1 provided on the base end side (right side in the figure) in the axial direction of the insert 10 Ri1 is different from the inner dimension ₍ inner diameter) Ri2 of the _second inner surface region _15i2 provided on the tip side (left side in the figure) in the axial direction. Here, in the illustrated example, the inner dimension _Ri2 is larger _than the inner dimension Ri1. As a result, the inner and outer dimensional difference of the _second inner surface region 15i2 with respect to the outer surface 12a is larger than the inner and outer dimensional difference with respect to the outer surface 12a of the _first inner surface region 15i1, as described above.

In this illustrated example, the inner surface portion 15i is composed of only the first inner surface region 15i- ₁ and the second inner surface region 15i- ₂ . Also, the first inner surface region 15i- ₁ and the second inner surface region 15i- ₂ are arranged adjacent to each other. In particular, the first inner surface region 15i ₁ has a constant inner dimension Ri ₁ over its entire axial length (length L ₁ ). Similarly, the _second inner surface region _15i2 has a constant inner dimension _Ri2 over its entire axial length (length L2). Further, in the illustrated example, the outer surface 12a of the base end side outer peripheral portion 12 has a constant outer dimension (outer diameter) _R0 in the axial direction in the non-operating region of the push ring 15, and is flat in the axial direction. be. As shown in the drawing, the base-end outer peripheral portion 12 has an axis line extending from a non-operating region where the push ring 15 does not contact the locking claw 24 to an operating region where the locking claw 24 contacts the driven surface 24a. It is preferably configured flat over a range of directions. As a result, the push ring 15 can be smoothly slid on the base end side outer peripheral portion 12, so that the operability of the push ring 15 when releasing the coupled state can be enhanced.

FIG. 3 shows that when the connected plug-in coupling 1 contacts the ground, floor surface, stairs, etc., the contact portion of the flange 15a of the push ring 15 receives an external force F, and as a result, the push ring 15 It shows a state in which the base end side outer peripheral portion 12 is greatly inclined with respect to the axis 10x. At this time, the push ring 15 is greatly inclined on the base end side outer peripheral portion 12, so that it can no longer slide in the axial direction toward the inside of the socket 20a. As will be described later, even if the flange portion 15a receives an external force F along the axial direction, the push ring 15 greatly inclines, and the external force F gives the push ring 15 a moment of force. Although the push ring 15 is pressed against the proximal end side outer peripheral portion 12, it is hardly moved to the distal end side in the axial direction.

4 and 5 are enlarged partial cross-sectional views showing enlarged upper and lower cross-sectional portions of the push ring 15 in the state shown in FIG. In this embodiment, since the inner dimension Ri2 is larger than the inner dimension Ri1, the inner and outer dimension difference _ΔR2 of the _second inner surface region _15i2 with respect to the proximal side outer peripheral portion ₁₂ is the same as that of the _first inner surface region 15i1. The inner and outer dimensional difference ΔR ₁ is larger than the difference ΔR 1 , so that the tiltable angle range of the push ring 15 with respect to the axis 10 x is greater than when ΔR ₂ is the same value as ΔR ₁ (conventional structure). At this time, in the push ring 15, since the inner and outer dimensional difference on the distal end side is larger than the inner and outer dimensional difference on the proximal end side in the axial direction, the operability of the collar portion 15a on the proximal end side is suppressed from deteriorating. , the amount of radial movement of the cylindrical portion 15b on the tip side can be increased. In addition, the possibility that the distal end portion of the push ring 15 contacts the distal inner edge portion 21 (the inner edges 23a and 26a) of the base end side outer peripheral portion 12 and the receiving opening 20a of the receiving tool 20 can be increased. Therefore, it is possible to achieve both operability of the push ring 15 and suppression of malfunction of the push ring 15 due to the external force F.

FIG. 6 is an explanatory diagram showing the attitude relationship of the push ring 15 with respect to the base end side outer peripheral portion 12. As shown in FIG. As described above, since the inner dimension Ri ₁ is smaller than Ri ₂ , the inner and outer dimension difference ΔR ₁ =Ri ₁ -R ₀ between the outer surface 12a of the proximal side outer peripheral portion 12 and the first inner surface region 15i ₁ is the outer surface 12a and the _second inner surface region 15i2 is smaller than the inner/outer dimension difference ΔR ₂ =Ri ₂ -R ₀ . At this time, the inclination angle between the proximal side outer peripheral portion 12 and the push ring 15 due to the inner/outer dimensional difference ΔR ₁ is determined by looking at the base end side outer peripheral portion 12' (outer surface 12a') indicated by the dashed line in the drawing. is regulated by α. That is, the _{inclination angle} of the push ring ₁₅ is set to , and is regulated within the maximum inclination angle α by the inner and outer dimension difference _ΔR1 . At this time, depending on the tilt direction of the push ring 15, the outer surface 12a of the base end outer peripheral portion 12 contacts the base end inner edge P1 of the _first inner surface region 15i1 on _one side in the tilt direction, The tip inner edge P2 of the _first inner surface region _15i1 is contacted on the other side of the inclination direction.

However, as shown in the figure, due to the relationship between the maximum inclination angle α, the inner/outer dimension difference ΔR ₂ of the _second inner surface region _15i2 , and the length L2 in the axial direction, the inclination angle of the push ring 15 is An inclined line connecting the tip inner edge P2 of the _first inner surface region 15i1 (the boundary position between the _second inner surface region _{15i2) and the tip inner edge P3 of the second inner} surface region _15i2 along the axial direction. It may be limited by the limit tilt angle β of Lo (indicated by the dotted line in the drawing). In the illustrated example, since the maximum tilt angle α is larger than the limit tilt angle β, the maximum tilt angle of the push ring 15 is β. Unlike the illustrated example, when the maximum tilt angle α is smaller than the limit tilt angle β (α<β), the maximum tilt angle of the push ring 15 is α. Therefore, in order to increase the tiltable angle range of the push ring 15 while suppressing the inner-outer dimension difference _ΔR1 of the _first inner surface region 15i1 as small as possible, it is preferable that α≦β. Here, the maximum tilt angle α and the limit tilt angle β are preferably within the range of α = 2.0 to 10.0 degrees, and β = 2.5 to 10.5 degrees. is preferred. Typically, it is desirable that α is within the range of 2.5 to 4.5 degrees and β is within the range of 3.0 to 5.0 degrees. For example, α=3.12 degrees and β=3.25 degrees. However, when the maximum tilt angle α is equal to or greater than the limit tilt angle β (α≧β), the tilt angle of the push ring ₁₅ is limited by the limit tilt angle β. and the tip inner edge P3 of the _second inner surface region _{15i2 are} in contact with the outer surface 12a of the base end side outer peripheral portion 12 at the same time, so that the movement resistance of the push ring 15 in the axial direction can be increased.

Further, as shown in FIG. ₆ , the tip outer edge P4 of the push ring 15 in the axial direction is separated from the proximal side outer peripheral portion 12' (outer surface 12a') when the push ring 15 is tilted. Therefore, when the tip-side outer edge P4 is far away from the outer surface 12a', it may come into contact with the tip inner edge portion 21 of the socket 20a of the receiving tool 20. As shown in FIG. _In this way, when the distal end outer edge P4 contacts the distal end inner edge portion 21 of the receiving port 20a, the number of contact points of the push ring 15 increases, thereby further increasing the movement resistance of the push ring 15 toward the distal end side in the axial direction. . At this time, although different from the illustrated example, if the shape of the push ring 15 is set so that the tip outer edge _P4 abuts against the inner edge 23a of the tightening ring 23 of the tip inner edge portion 21, the claw seat 26 can be secured. Since the inner dimension (inner diameter) of the inner edge 26a is smaller than the inner dimension (inner diameter) of the inner edge 23a of the clamp ring 23, even if the push ring 15 were to slide toward the tip side in the axial direction, there would be no gap between the inner edge 23a and the inner edge 26a. can be configured so that it is blocked by a step and cannot slide any further. When the push ring 15 is in an inclined position, even if the tip outer edge _P4 , which is the tip of the push ring 15, does not contact the inner edge 26a, the tip inner edge _P4 is located outside the inner dimension of the inner edge 23a. If it is configured to approach the inner edge 26a, the inner edge 23a, which has a smaller inner dimension than the tip inner edge P4, stands _on the tip side, so that further sliding of the push ring 15 can be suppressed. At this time, if the push ring 15 moves a little to the tip side in the axial direction, the outer edge _P4 of the tip comes into contact with the inner edge 23a, and further movement of the push ring 15 is restricted.

The axial length L1 of the _first inner surface region _15i1 and the length L2 of the _second inner surface region _15i2 can be set appropriately. However, the overall length L=L ₁ +L ₂ of the push ring 15 is often restricted due to the operability of the push ring 15 and the distance between the operating range and the non-operating range. Therefore, it is preferable that the relationship between L1 and _L2 be as follows, depending _on the relationship between the maximum inclination angle α and the limit inclination angle β. First, it is preferable that L ₁ <L ₂ . This is because by making L1 relatively small, the maximum inclination angle α can be increased without changing the inside _- outside dimension difference _ΔR1 .

Further, it is preferable to secure _a large maximum inclination angle α by reducing L1 as described above, but considering the operability of the push ring 15, it is necessary to secure _L2 to some extent. _In particular, as L2, the length corresponding to the axial distance from the opening position of the socket 20a to the driven surface 24a of the locking pawl 24 through the tightening ring 23 and the inside of the pawl seat 26 is the minimum. It is necessary, and if possible, it is desired that the length is equal to or longer than the distance from the opening position to the locking stepped portion 11b. Therefore, it is desirable that L ₁ ≤ L ₂ /2. In the illustrated example, L ₁ <L ₂ /3. Considering the operability of the push ring 15 when the coupled state is released, it is preferable that the relationship between the length L ₁ and the inner/outer dimension difference ΔR ₁ satisfies L ₁ ≧ΔR ₁ ×10, and L ₁ ≧ΔR ₁ ×30 is desirable.

Incidentally, in JIS B 9911 _, the distance from the contact position with respect to the snap ring 13 to the locking stepped portion 11b is specified by the value of l3 in "4.6 Joint", and the shape of the push ring 15 is as follows: _The outer diameter of the flange portion 15a is defined by d2 of "4.5 push ring", and the outer diameter of the tubular portion _15b is defined by the same d1. On the other hand, D indicates the inner diameter of the inner surface portion 15i of the push ring ₁₅ , and l1 and l2 indicate the _overall axial length L of the push ring 15 and the thickness (axial length) of the collar portion 15a. are shown, but all are recommended dimensions. Therefore, there is no restriction on the inner dimension of the inner surface portion 15i.

FIG. 7 shows the base end side outer peripheral portion 12 (outer surface 12a) fixed, and also shows the positions and positions of the upper section and the lower section of the push ring 15 in an inclined position. The external force F applied to the collar portion 15a of the push ring 15 tilts the push ring 15 as shown in the drawing _{about the proximal inner edge P1 of the first inner} surface region 15i1. As a result, force is applied to the proximal inner edge P1 and the distal inner edge P2 _on the opposite _side toward the distal end in the axial direction or the distal inner edge P3 of the _second inner surface region _15i2 . A moment of force M is applied to the push ring 15 . Therefore, no driving force is generated to move the push ring 15 toward the tip side (left side in the figure) in the axial direction with respect to the base end side outer peripheral portion 12, so that the release of the coupled state due to malfunction of the push ring 15 is prevented.

Due to the above effects, in this embodiment, by converting the external force F in the axial direction into the moment M, malfunction of the push ring 15 is prevented. Therefore, the outer dimension (outer diameter) of the collar portion 15a of the push ring 15, which indicates the position of the point of application for receiving the external force F, is formed to be large, and is close to the outer dimension (outer diameter) of the tightening ring 23 and the protective member 27. Even if it is set, the moment M only increases, and the effect of preventing malfunction of the push ring 15 is not reduced. For this reason, in the present embodiment, there is no need to make the outer dimensions of the collar portion 15a smaller than the outer dimensions of the tightening ring 23 and the protective member 27 to avoid malfunctions. A secondary effect is also obtained that the outer dimensions can be made compact and the operability can be improved by securing the outer dimensions of the flange portion 15a. For example, the protective member 27 may be omitted.

It should be noted that the plug-in type coupling joint and its insert according to the present invention are not limited to the above-described illustrated examples, and of course various modifications can be made without departing from the gist of the present invention. . In the first embodiment, the inner surface portion 15i of the push ring 15 is provided with portions having different inner dimensions. If a different portion is configured, for example, a portion having a different outer dimension may be provided on the outer surface 12a of the proximal side outer peripheral portion 12 in the non-operating area of the push ring 15, or the inner surface portion A portion with different inner dimensions may be provided in 15i, and a portion with different outer dimensions may be provided in proximal side outer peripheral portion 12 at the same time.

Further, in the above-described first embodiment, the _first inner surface region 15i1 is arranged on the proximal end side in the axial direction, and the _second inner surface region 15i2 is arranged on the distal end side in the axial direction. Conversely, however, the _first inner surface region 15i1 may be located axially distally and the _second inner surface region 15i2 may be located axially proximally. Furthermore, in the above-described first embodiment, the inner surface portion 15i is formed in a stepped shape. For example, the contour of the inner surface portion 15i in the axial direction may be configured to have a convex curved surface, a concave curved surface, or an uneven curved surface.

Next, a plug-in coupling joint 2 of a second embodiment according to the present invention will be described with reference to FIGS. 9-12. In this second embodiment, a separate push ring 16 is used in place of the push ring 15 of the first embodiment, but the rest of the configuration can be configured in the same manner as the plug-in coupling joint 1 of the first embodiment. Therefore, the description of the configuration other than the push ring 16 is omitted, and the same reference numerals are given to the same parts.

As shown in FIGS. 9 and 10, the push ring 16 of the present embodiment has a flange portion 16a extending from the inside to the outside in the radial direction, and a and a cylindrical portion 16b extending in the direction of the axis 16x from the radially inner portion (inner peripheral edge). _An inclined surface 16a1 inclined radially outward is formed on the base end side surface of the collar portion 16a, that is, on the outer surface facing the opposite side of the cylindrical portion 16b in the direction of the axis 16x. there is The inclined surface 16a- ₁ is provided with a plurality of finger-hooking portions 16a- ₂ having a cut shape (concave shape) as indicated by dotted lines in FIG. 10(b). _The finger hooking portion 16a2 has a flat finger hooking surface perpendicular to the axis 16x. In the illustrated example, the finger hooks 16a2 _are formed at equal angular intervals at four locations around the axis. These four finger hooks 16a2 form _{two pairs} of finger hooks 16a2 facing each other across the axis 16x. As a result, the operator who wants to release the connected state of the plug-in type coupling joint ₂ is forced to press the right and left thumbs against one of the pairs of finger hooks 16a2. As a result, the push ring 16 can be pressed stably and reliably by putting the thumb on the finger-hooking surface at both positions opposite to each other with the axis 16x interposed therebetween. Note that the front end side surface of the flange portion 16a is a flat surface.

The inner surface portion 16i of the push ring 16 is formed over an axial range from the radially inner side of the collar portion 16a to the radially inner side of the cylindrical portion 16b. In the above range, the inner surface portion 16i includes a _first inner surface region 16i1 having a tubular shape (cylindrical surface shape in the illustrated example) and a tip end side (right side in FIG. 10) of the _first inner surface region 16i1. and a _second inner surface region 16i2 arranged in a vertical direction. The first inner surface region 16i1 has a constant inner dimension (inner diameter) in the axial direction as in the _first embodiment. In addition, the _second inner surface region 16i2 opens toward the distal side in the axial direction from the proximal edge having an inner dimension that is substantially the same (slightly larger) than the _first inner surface region 16i1 (the inner dimension is gradually increasing) with a surface shape (conical surface shape in the illustrated example) that is inclined with respect to the axis 16x. That is, in this embodiment, the surface of the _second inner surface region 16i2 has a linear sloping contour along the axis 16x. However, as described above, the contours of the first inner surface region 16i ₁ and the second inner surface region 16i ₂ , or the contours of only the second inner surface region 16i ₂ are not linear but convex curved. Alternatively, it may be configured to have a concave curved surface.

Here, in the illustrated example, the inclination of the _second inner surface region 16i2 is formed by changing the thickness of the cylindrical portion 16b in the axial direction. Here, since the cylindrical portion 16b has a cylindrical outer peripheral surface, the surface shape of the inner surface portion 16i is formed only by the change in the thickness of the cylindrical portion 16b. In this illustrated example, as in the first embodiment, the first inner surface region 16i- ₁ and the second inner surface region 16i- ₂ are arranged adjacent to each other in the inner surface portion 16i. However, another inner surface area may exist between the first inner surface area 16i- ₁ and the second inner surface area 16i- ₂ , or a step may be provided. When the latter step is provided, the minimum value of the _second inner dimension Ri2 is larger than the _first inner dimension Ri1 by the step.

In addition, the inner surface portion 16i has, on the base end side (the left side in FIG. 10) of the _first inner surface region 16i1, an accommodating groove ( _one -sided recess) having an inner dimension larger than the inner dimension Ri1 of the _first inner surface region 16i1. It further has a _third inner surface area 16i3 forming a groove. As shown in FIG. 11, the _third inner surface region 16i3 is configured to accommodate the retaining ring 13 that is engaged with the base end side outer peripheral portion 12, and is adjacent to the first inner surface region 16i. ₁ , a stepped portion is formed due to the difference in inner dimensions. When this stepped portion comes into contact with the snap ring 13, the limit position of the proximal side of the push ring 16 on the proximal side outer peripheral portion 12 is set, and the push ring 16 is pushed to the proximal side with respect to the main body of the insert. Retaining is realized.

The first inner surface region 16i- ₁ may be extended to the base end edge of the inner surface portion 16i, as in the first embodiment, without providing the third inner surface region 16i- ₃ . However, by providing the _third inner surface area 16i3 as in the illustrated example, the inclined surface 16a1 can be formed _on the collar portion 16a without changing the position of the retaining ring 13. FIG. In addition, it is possible to prevent malfunction of the push ring 16 without changing the axial length of the cylindrical portion 16b for ensuring ease of uncoupling operation. Furthermore, by providing the inclined surface 16a1 on the base end _side surface of the collar portion 16a, the push ring 16 can be easily rotated when _an external force F is applied to the inclined surface 16a1. Since it becomes easier to change the posture of the device, it is possible to further reduce malfunctions.

Further, in the configuration shown in FIG. 11 where the push ring 16 is in the non-operating region on the insert main body, the retaining ring 13 is in contact with the _third inner surface region 16i3 or opposed to the third inner surface region 16i3 with a slight gap. dimensioned. As a result, when the push ring 16 is in the position where the snap ring 13 is accommodated, the _third inner surface region 16i3 abuts against the snap ring 13, thereby preventing the push ring 16 from tilting on the base end side outer peripheral portion 12. or so that the angle of inclination is smaller than when the _third inner surface region 16i3 is axially spaced from the snap ring 13. As shown in FIG. As a result, the posture of the push ring 16 is less likely to be lost in the initial stage of the decoupling operation when the push ring 16 is in the position where the retaining ring 13 is accommodated, so that the posture of the push ring 16 when not receiving an external force is maintained. , the decoupling operation is further facilitated. However, in the illustrated example, a sufficient gap exists between the snap ring 13 and the _third inner surface region 16i3 so that the tilted posture of the push ring 16 is not hindered.

Here, the length of the _first inner surface region _16i1 in the direction of the axis _16x (between the proximal inner edge P1 and the distal inner edge P2) is L1, the inner dimension (the inner diameter in the illustrated example) is _Ri1 , and the _second Let L ₂ be the length (between the tip inner edge P ₂ and the tip inner edge P ₃ ) of the inner surface region 16i ₂ of the inner surface 16i 2 in the direction of the axis 16x, and Ri ₂ be the inner dimension (the inner diameter in the illustrated example). At this time, the inner dimension Ri2 of the _second inner surface region _16i2 is almost the same as (slightly larger) than the inner dimension Ri1 at the proximal edge adjacent to the _first inner surface region _16i1 , but from here to the tip. It gradually increases towards the edge and reaches a maximum value at the leading edge. The relationship between the lengths L ₁ and L ₂ and the inner dimensions Ri ₁ and Ri ₂ (or the inner and outer dimensional differences ΔR ₁ and ΔR ₂ ) are the same as those described in the first embodiment, so the description is omitted. do. The proximal inner edge P ₁ , the distal inner edge P ₂ , the distal inner edge P ₃ , and the distal outer edge P ₄ are also completely the same as those in the first embodiment, and thus description thereof will be omitted. At this time, in the present embodiment, the inner surface portion 16i of the push ring 16 is axially aligned with the tip inner edge P2 of the _first inner surface region in the first embodiment and the tip inner edge P3 of the _second inner surface region. It can be considered that the contour has the above-mentioned contour in a shape connected by a chain. However, this embodiment differs from the first embodiment in that L ₁ =L ₂ . As a result, it is possible to achieve both the ease of changing the posture of the push ring 16 and the stability of the uncoupling operation. This configuration can be similarly adopted in the first embodiment.

As described above, when the retaining ring 13 is in contact with or is close to the _third inner surface region 16i3 (when the distance between the retaining ring 13 and the _third inner surface region 16i3 is small), as shown in FIG. As shown, within the range of the non-operating region on the base end side outer peripheral portion 12, when the push ring 16 moves slightly toward the distal end side in the axial direction from the position indicated by the dotted line in the drawing, as indicated by the solid line in the drawing, the third Since the restraining action of the posture of the push ring 16 due to the engagement of the inner surface region _16i3 of the ring 13 with the retaining ring 13 is released, the push ring 16 can be tilted with respect to the base end side outer peripheral portion 12 as shown by the two-dot chain line in the drawing. state. In such a state, in the regulated state shown in FIG. 11 (indicated by dotted lines in FIG. 12), the external force F similar to that described in the first embodiment acts on the collar portion 16a, causing the push ring 16 to move. shifts to the state indicated by the solid line in FIG. 12, and then rotates as indicated by the arrow to assume an inclined posture (indicated by the two-dot chain line in FIG. 12). Note that the direction of inclination of the inclined posture indicated by the chain double-dashed line in FIG. 12 shows an example in which the inclined posture shown in FIGS. 3 and 4 is upside down. However, as in the illustrated example, when a sufficient space is secured between the retaining ring 13 and the _third inner surface region 16i3 in the state shown in FIG. Even if 16 does not move, it is possible to shift to the tilted posture as it is at the position indicated by the dotted line in FIG.

In this second embodiment, even if L ₁ , L ₂ , Ri ₁ , and Ri ₂ are substantially the same as in the push ring 15 of the first embodiment, the thickness of the cylindrical portion 16b is the second highest. The rigidity of the push ring 16 can be increased because it is configured to change gradually instead of abruptly as in the first embodiment. In addition, when the posture of the push ring 16 is tilted, the _second inner surface area 16i2 contacts the base end outer peripheral portion 12 over the entire axial direction. Since it is possible to increase the contact range with the push ring 12, it is possible to further suppress the sliding movement in the axial direction of the push ring 16 in the tilted posture. In any of the embodiments, if L ₁ <L ₂ with respect to the first length L ₁ and the second length L ₂ , the tilted posture of the push ring is likely to cause a locked state. As L ₁ =L ₂ in the illustrated example approaches, the operational stability of the push ring during the releasing operation is improved. In the illustrated example, as described above, the entire axial direction of the _second inner surface region 16i2 in a certain direction around the axis is configured to be able to contact the surface 12a of the base end side outer peripheral portion 12. , the present invention is not limited to such an embodiment.

In the second embodiment, as described above, the surface on the base end _side of the collar portion 16a of the push ring ₁₆ is the inclined surface 16a1 facing diagonally outward in the radial direction, so that the external force F is applied to the inclined surface 16a1. When applied, the external force F tends to cause the push ring 16 to rotate. For this reason, the push ring 16 can be more reliably placed in an inclined posture on the proximal end side outer peripheral portion 12 , so that the locking claw 24 can be prevented from malfunctioning by the push ring 16 more reliably. Incidentally, such _a configuration of the inclined surface 16a1 may be employed in the push ring 15 of the first embodiment. Similarly, the various configurations in each of the above-described embodiments can be applied to other embodiments as long as there is no contradiction or trouble with other configurations.

DESCRIPTION OF SYMBOLS 1, 2... Coupling joint, 10... Insert, 10a... Insertion, 11... Tip cylinder part, 11a... Outer peripheral surface, 11b... Locking stepped part, 11p... Tip outer edge, 11q... Base end outer edge, 12... Base end side outer peripheral portion 12a outer surface Ro outer dimension 13 snap ring 14, 15, 16 push ring 15a, 16a flange 16a ₁ inclined surface 16a ₂ finger hook 15b, 16b ... Cylindrical portion, P4... Distal outer edge, 15i, _16i ... Inner surface portion, _15i1 , _16i1 ... _First inner surface area, P1... Base end inner edge, P2... _Distal inner edge, _Ri1 ... Inner dimension, ? _R1 Inner/outer dimensional difference, L ₁ : length in the axial direction, 15i ₂ , 16i ₂ : second inner surface area, 16i ₃ : third inner surface area (single-concave groove), P ₃ : tip inner edge, Ri ₂ : inside Dimension, ΔR ₂ : inner/outer dimensional difference, L ₂ : axial length, 20: receiving tool, 20a: receiving opening, 21: tip inner edge part, 22: receiving tool main body, 23: fastening ring, 23a: inner edge, 24: Locking pawl 25 Leaf spring 26 Pawl seat 26a Inner edge 27 Protection member 28 Packing

Claims (14)

a distal cylindrical portion having a locking stepped portion with which a locking pawl can be engaged on the proximal side in the axial direction; a proximal side outer peripheral portion extending axially to the proximal side of the locking stepped portion; an insert having a push ring axially slidably mounted on the side outer peripheral portion; a socket configured to receive the tip end tube; A coupled state is formed by engaging with the locking stepped portion, and in the coupled state, the push ring inserted into the operating area on the distal end side on the proximal side outer peripheral portion retracts and the coupled state is released. A plug-in coupling joint comprising a receiver having the locking pawl configured as
When the push ring is arranged in the proximal non-operating area on the proximal side outer peripheral portion, the inner surface portion of the push ring facing the proximal side outer peripheral portion is positioned at a first position in the axial direction. a first inner surface region configured to be able to abut against the proximal side outer peripheral portion at the first position and having a first inner and outer dimensional difference between the proximal side outer peripheral portion at the first position; At a second position in the axial direction different from the position of the first inner and outer dimensions between the outer peripheral portion on the proximal side and the outer peripheral portion on the proximal side at the second position. a second inner surface region having a second inner-outer dimensional difference greater than the difference;
The push ring is configured to be tiltable in a larger angular range on the proximal side outer peripheral portion than when the second inner-outer dimensional difference is equal to the first inner-outer dimensional difference,
Plug-in coupling fitting. The first inner surface region is arranged in a region on the proximal end side in the axial direction of the inner surface portion,
The second inner surface region is arranged in a region on the tip side in the axial direction of the inner surface portion,
A plug-in coupling joint according to claim 1. The second inner dimension of the portion corresponding to the second inner-outer dimension difference in the second inner surface region is the first inner dimension of the portion corresponding to the first inner-outer dimension difference in the first inner surface region. greater than
3. A plug-in coupling joint according to claim 1 or 2. The base-side outer peripheral portion has a constant outer dimension in the axial direction at least within a range in which the push ring can move in the axial direction between an operating region in contact with the locking pawl and the non-operating region,
4. A plug-in coupling joint according to claim 3. the first inner surface region is a region having the first inner dimension that is constant in the axial direction;
the second inner surface area is an area having the second inner dimension that is constant in the axial direction;
A plug-in coupling joint according to claim 3 or 4. the first inner surface region is a region having the first inner dimension that is constant in the axial direction;
The second inner surface region is a region in which the second inner dimension gradually increases with distance from the first inner surface region in the axial direction.
A plug-in coupling joint according to claim 3 or 4. said first inner surface region and said second inner surface region are positioned axially adjacent to each other;
A plug-in coupling joint according to claim 5 or 6. The second inner dimension and axial length of the second inner surface region are set to values that do not limit the maximum tilt angle determined by the first inner dimension and axial length of the first inner surface region. is set,
A plug-in coupling joint according to any one of claims 5-7. The second inner surface region has a range that reaches the tip side edge in the axial direction of the push ring,
An axis line of an inclined line that axially connects a distal inner edge that can contact the proximal-side outer peripheral portion of the first inner surface region and a distal inner edge formed on the distal-side edge portion of the second inner surface region. is greater than or equal to the maximum tilt angle for
9. A plug-in coupling joint according to claim 8. a first axial length of the first inner surface region is less than a second axial length of the second inner surface region;
A plug-in coupling joint according to any one of claims 5-9. the first length is less than or equal to half the second length;
11. A plug-in coupling joint according to claim 10. The distal end portion of the push ring in the non-operating area is configured to be able to abut against the tip inner edge portion of the receptacle of the receptacle due to an inclined attitude of the push ring with respect to the base end side outer peripheral portion.
A plug-in coupling joint according to any one of the preceding claims. The distal inner edge has a first inner edge disposed on the distal side of the receptacle and a second inner edge disposed on the proximal side of the first inner edge,
the inner dimension of the second inner edge is smaller than the inner dimension of the first inner edge;
The distal end portion of the push ring is configured to be able to come into contact with or approach the first inner edge portion beyond the inner dimension of the second inner edge portion due to the inclined posture,
13. A plug-in coupling joint according to claim 12. The push ring has a flange-shaped collar portion projecting toward the outer peripheral side at the proximal end side or intermediate portion in the axial direction, and a cylindrical portion extending from the collar portion toward the distal end side in the axial direction,
A surface on the base end side of the collar portion of the push ring is provided with an inclined surface facing diagonally outward in the radial direction,
A plug-in coupling joint according to any one of the preceding claims.

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